🐛 Check README order within licensing subgroups

.github/scripts/check-readme-order.mjs

@@ -8,7 +8,7 @@ if (!basePath || !currentPath) {
   process.exit(2);
 }
 
-const SORTED_SECTION = "Community Extensions";
+const SORTED_SECTION = "Extensions / Community Extensions";
 const IGNORED_SECTIONS = new Set(["Contents"]);
 
 function headingName(markdown) {
@@ -18,12 +18,18 @@ function headingName(markdown) {
 
 function parseSections(path) {
   const sections = new Map();
+  const headings = [];
   let section = null;
 
   for (const line of readFileSync(path, "utf8").split("\n")) {
-    const heading = line.match(/^#{2,3}\s+(.+?)\s*$/);
+    const heading = line.match(/^(#{2,6})\s+(.+?)\s*$/);
     if (heading) {
-      section = headingName(heading[1]);
+      const level = heading[1].length;
+      while (headings.length > 0 && headings.at(-1).level >= level) {
+        headings.pop();
+      }
+      headings.push({ level, name: headingName(heading[2]) });
+      section = headings.map(({ name }) => name).join(" / ");
       if (!sections.has(section)) {
         sections.set(section, []);
       }

.github/scripts/check-readme-order.test.mjs

@@ -0,0 +1,103 @@
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { test } from "node:test";
+
+const entry = (name) => `- [${name}](https://example.com/${name}) - Description.`;
+const communityHeading = "## Extensions\n### [Community Extensions](https://duckdb.org/community_extensions/)";
+const subgroupBase = [
+  "## Tools Powered by DuckDB",
+  "### Business Intelligence & Dashboards",
+  "#### Free & Open Source",
+  entry("Pondview"),
+  "#### Free (Proprietary / Source-Available)",
+  entry("Proprietary"),
+  "### Fun & Demos",
+  "#### Free & Open Source",
+  entry("Demo"),
+].join("\n");
+
+const cases = [
+  {
+    name: "append to a flat section",
+    base: `## Resources\n${entry("Existing")}`,
+    current: `## Resources\n${entry("Existing")}\n${entry("New")}`,
+    valid: true,
+  },
+  {
+    name: "reject insertion before an existing flat entry",
+    base: `## Resources\n${entry("Existing")}`,
+    current: `## Resources\n${entry("New")}\n${entry("Existing")}`,
+    valid: false,
+  },
+  {
+    name: "append to a licensing subgroup before another subgroup",
+    base: subgroupBase,
+    current: subgroupBase.replace(entry("Pondview"), `${entry("Pondview")}\n${entry("DUX")}`),
+    valid: true,
+  },
+  {
+    name: "reject insertion within a subgroup despite matching entries in another category",
+    base: subgroupBase,
+    current: subgroupBase.replace(entry("Pondview"), `${entry("Demo")}\n${entry("Pondview")}`),
+    valid: false,
+  },
+  {
+    name: "move an entry to the bottom of its destination subgroup",
+    base: `${subgroupBase}\n${entry("DUX")}`,
+    current: subgroupBase.replace(entry("Pondview"), `${entry("Pondview")}\n${entry("DUX")}`),
+    valid: true,
+  },
+  {
+    name: "reset subgroup context at a top-level section",
+    base: `${subgroupBase}\n## Resources\n${entry("Existing")}`,
+    current: `${subgroupBase}\n${entry("NewDemo")}\n## Resources\n${entry("Existing")}\n${entry("NewResource")}`,
+    valid: true,
+  },
+  {
+    name: "allow updating an existing description in place",
+    base: `## Resources\n${entry("Existing")}\n${entry("Last")}`,
+    current: `## Resources\n${entry("Existing").replace("Description.", "Updated description.")}\n${entry("Last")}`,
+    valid: true,
+  },
+  {
+    name: "keep community extensions case-insensitively sorted",
+    base: `${communityHeading}\n${entry("`beta`")}`,
+    current: `${communityHeading}\n${entry("`Alpha`")}\n${entry("`beta`")}`,
+    valid: true,
+  },
+  {
+    name: "reject unsorted community extensions",
+    base: `${communityHeading}\n${entry("`beta`")}`,
+    current: `${communityHeading}\n${entry("`beta`")}\n${entry("`Alpha`")}`,
+    valid: false,
+  },
+  {
+    name: "ignore contents ordering",
+    base: `## Contents\n${entry("Existing")}`,
+    current: `## Contents\n${entry("New")}\n${entry("Existing")}`,
+    valid: true,
+  },
+];
+
+for (const { name, base, current, valid } of cases) {
+  test(name, () => {
+    const directory = mkdtempSync(join(tmpdir(), "readme-order-"));
+    try {
+      const basePath = join(directory, "base.md");
+      const currentPath = join(directory, "current.md");
+      writeFileSync(basePath, base);
+      writeFileSync(currentPath, current);
+      const result = spawnSync(process.execPath, [
+        new URL("./check-readme-order.mjs", import.meta.url).pathname,
+        basePath,
+        currentPath,
+      ], { encoding: "utf8" });
+      assert.equal(result.status, valid ? 0 : 1, result.stderr || result.stdout);
+    } finally {
+      rmSync(directory, { recursive: true, force: true });
+    }
+  });
+}